Tube



FIG. 1 is a perspective view of a tube showing my new design;

FIG. 2 is a front view thereof, a rear view being identical to the front view;

FIG. 3 is right side view thereof, left side view being identical to the right side view;

FIG. 4 is a plan view thereof; and,

FIG. 5 is bottom view thereof. 

CLAIM The ornamental design for a tube, as shown and described. 